package com.mmall.concurrency.example.singleton;

import com.mmall.concurrency.annoations.NotRecommend;
import com.mmall.concurrency.annoations.NotThreadSafe;
import com.mmall.concurrency.annoations.ThreadSafe;

/**
 * 懒汉模式
 * 单例实例在第一次使用时进行创建
 */

@ThreadSafe
@NotRecommend
public class SingletonExample3 {

    //私有构造函数
    private SingletonExample3()
    {

    }

    //单例对象
    private static SingletonExample3 singleton = null;

    // 静态的工厂方法
    public static synchronized SingletonExample3 getSingleton() {
        if(singleton == null)
        {
            singleton = new SingletonExample3();
        }
        return singleton;
    }
}
